Bsi bs au 003 1970 (1999)

BRITISH STANDARD AUTOMOBILE SERIES BS AU 3 1970 Specification for Clearance dimensions and fifth wheel positions for tractors and semi trailers UDC 629 114 2 013 6 BS AU 3 1970 This British Standard,[.]

Specification for

U C 6 9.1 4.2.0 3.6

This Bri sh Stan ard, ha ing

b en a pro ed b the

Automo ileIn ustry

Stan ardsCommi e ,was

published u der the

authoriyofthe Ex cutv

Bo rdof the Inst uton on

2 Mar h1 7

© BSI 0 -1 9

The folowing BSI reference

relates to the work on this

stan ard:

Commi e reference AUE/

This British Stand ard, prep red u d er the authority of the Automobie

Industry Stand ards Commit e of the BSI, was fir t publshed in19 3 and

later rev ised in19 8 to as ist inter hang ea i ity of tractor and semi trai er

to the weig hts an dimensions permit ed b the Motor V ehicles ( Construction

and Use) Reg ulations No.32 :19 9 The present rev ision incorporates

a ditional d ta for articulated v ehicles considered neces ary as a result of

ex erience in the use of the stand rd

Traier man facturer wi note that the a plcation of this stand rd depends

upon the k owled g e of the dimensions of the towing v ehicles User wi note

that the phy sical inter hang ea i ty betwe n the towing v ehicle and the

semi traier do s not itself ensure comp tibi ity of loa car y ing , braking ,

lg hting an ov eral leng th

It is important that the eq uipment be so desig ned that semi traier wi l couple

easiy and satis actori y with the towing v ehicle, an not slope forward when

the fifth whe l is mou ted in ac ord nce with the dimensions g iv en in this

stand rd

NOT The v lues sp cified in imp rial u is are to b reg arded as the stan ard The metric u is

are g iv n as a pro imate e uiv lents

A British Stand rd do s not purport to include al the neces ary prov isions of

a contract User of British Stand ard s are responsible for their cor ect

a pl cation

Compl anc with a British Standard does not of itselfconfer imm unity

f om leg al o l g ations

Sum m ary of pag es

This d ocument comprises a f ont cov er, an inside font cov er, p g es i and i ,

p g es 1 to 4 an a b ck cov er

This stand rd has be n upd ated ( se copy rig ht d ate) and ma hav e had

amend ments incorporated This wi l be indicated in the amendment ta le on

the inside f ont cov er

Am endm ents is ued sinc publ cation

Pag e

Fig ure 1 — Dimensions of towing v ehicle with sing le rear

Fig ure 2 — Clearance dimensions betwe n towing v ehicle

Ta le 1 — Prefer ed d imensions for sing le a le semi traier

in articulated v ehicles not exce ding 20 tons an tand em a le

semi traier in articulated v ehicles not exce d ing 24 tons

Ta le 2 — Prefer ed d imensions for sing le a le semi traier

in articulated v ehicles exce ding 20 tons and tandem a le

semi traier in articulated v ehicles exce d ing 24 tons g ros

Ta le 3 — Towing v ehicle with sing le rear a le heig ht to face

of fifth whe l f om g rou d v ehicle u la en and uncoupled 3

1 Scope

1.1 This British Stand rd specifies clearance dimensions and the positions and heig hts of fifth whe l

at achments fit ed to the tractive u its of articulated v ehicles for the purpose of coupl ng semi trai er It

relates to towing v ehicles with sing le rear a les not exce ding2.5metres width and to semi trai er fit ed

with king pins comply ing with BSA U1

1)

1.2 The stand ard a ples to v ehicles in normal roa use and exclud es v ehicles used u der c os -cou try

cond itions

The b sic dimensions shal be as g iv en in Ta le 1, Ta le 2 and Ta le 3, with reference to Fig ure 1 and

Fig ure 2 Ta le 1 and Ta le 2 g iv e prefer ed dimensions for the tractor an semi trai er as fol ows:

NOT S bject to ag re ment b twe n the user an the man facturer, an where sp cial con i ons e ist, the dimensions g iv n in

eiher Ta le 1 or Ta le 2 ma b selected as alternatv s

Ta le 3: g iv es the heig hts of the fifth whe l face fom the g rou d

Table 1 — Prefer ed dim ensions for sing le a le sem i- trai er in articulated vehicles

notexc eding 2 tons and tandem a le semi-trai er in articulated vehicles

not exc eding 2 tons g ros train weig ht

1)

BS AU1, “Dimensions of2 – 2+ in d iamete fifth whe l kin pin for us wih smi-tr aier s”

Ta le 1: prefer ed d imensions for sing le a le semi trai er in articulated v ehicles not exce ding20tons

and tandem a le semi traier not exce ding24tons g ros train weig hts

Ta le 2: prefer ed d imensions for sing le a le semi traier in articulated v ehicles exce d ing20tons an

tand em ax le semi trai er in articulated v ehicles ex ce ding24tons g ros train weig hts

Position of fifth whe l f om centre of rear a le D min

D ma

6 min

1 ma

15 min

3 5 ma

Distance f om point C on clearance plane at b ck of ca to

centre lne of rear a le

Distance f om centre lne of king -pin to point C on clearance

plane at b ck of ca or other chas is eq uipment

Distance f om fifth whe l to extreme rearward s projection of

v ehicle

X

1

Distance fom king -pin to extreme forward projection of

semi traier

Distance fom king -pin rearward s to any projection l kely to

foul towing v ehicle

Distance f om fifth whe l face to point C on clearance plane h 4 10

Ang le of forward inclnation of clearance plane f om point C µ 8° 8°

Ma imum flat width of b ck of ca to permit 10 ° articulation

of semi trai er

Clearance ang le at sides of rear of ca to permit 10 °

articulation of semitrai er

Ta le 2 — Prefer ed dimensions for sing le axle sem i- trai er in articulated

vehiclesexc eding2 tons and tandem a le sem i- trai er in articulated vehicles

exc eding 2 tonsg ros vehicle weig ht

3 Articula tion

Care shal be taken to ensure that when working to the positions and heig hts shown in the ta les there

shal be no foulng betwe n the rear of the towing v ehicle and its mudg uards and the a jacent p rts of the

semi traier at a fore and aft articulation of up to plus and min s8° f om the desig ned static position when

the combination is in a straig ht lne

The clearance plane p s ing throug h point C ( se Fig ure 2) at the b ck of the ca is a flat transv er e plane

sloping forward f om point C at an ang le of8° as shown and is intend ed to prov ide clearance for the8° fore

an aft articulation req uirement, an for semi trai er clearance ov er chas is eq uipment mou ted at the

b ck of the tractor ca

The ca profi e shown in Fig ure 2 permits a ma imum semitrai er articulation of10 ° The clearances of

v ehicles bui t to the dimensions in Ta le 2 are such that the flat b ck of ca ma extend to the ful leg al

width of2.5metres

4 Heig hts

The heig hts of the fifth whe l face f om the g rou d , with the v ehicle u la en an u coupled , shal be as

g iv en in Ta le 3 when the fifth whe l is set at a minimum of6in ( 15 mm) and a ma imum

of27in( 68 mm) forward of the rear a le centre l ne The heig hts of intermediate positions shal be

determined on a sloping l ne betwe n the position6in ( 15 mm) forward of the rear a le centre- ne and

the position27in ( 68 mm) forward of the rear ax le centre- ine

NOT 1 These heig hts are b sed on the towing v hicle re r spring s ha ing a deflecton of a pro imately3 in (7 mm) laden to

u laden

NOT 2 I is emphasized that adv ntag e should b taken of the heig ht tolerances sp cified only in e treme cases where coupling

could not b otherwise efected

Position of fifth whe l fom centre of rear a le D min

D ma

1 min

27 ma

3 5 min

6 5 ma

Distance f om point C on clearance plane at b ck of ca to centre l ne

of rear a le

Distance f om centre l ne of king -pin to point C on clearance plane at

b ck of ca or other chas is eq uipment

Distance f om fifth whe l to extreme rearwards projection of towing

v ehicle

X

2

7 ma 1 9 0 ma

Distance f om king -pin to ex treme forward projection of semi trai er Y 6 ma 1 525 ma

Distance f om king -pin rearwards to any projection lkely to foul

towing v ehicle

Distance f om fifth whe l face to point C on clearance plane h 4 10

Ang le of forward incl nation of clearance plane f om point C µ 8° 8°

Ma imum flat width of b ck of ca to permit 10 ° articulation of

semi trai er

Clearance ang le at sides of rear of ca to permit 10 ° articulation of

semi trai er

Ta le 3 — Towing vehicle with sing le rear a le heig ht to fac of fifth whe l f om

g round vehicle unla en and uncoupled ( se Fig ure 1) ( United King d om an ov er eas)

Tyr siz

Dim ensions H

at D = 6 in

(1 0 m m )

at D = 2 in

(6 5 m m )

7.5 – 20

8.25 – 20

or ty res of equiv alent diameter

9.0 – 20

or ty res of equiv alent diameter

10.0 – 20

or ty res of equiv alent diameter

1 0 – 20

or ty res of equiv alent diameter

NOT The dimensions for H in this ta le are subject to a tolerance of plus an min s1in ( 25mm)

Fig ure 1 — Dimensions oftowing vehicle with sing le rear a le and of semi-trai er

Fig ure 2 — Clearanc dim ensions betwe n towing vehicle and sem i- trai er

topermitspe ifiedarticulation

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